/
example_server.go
147 lines (133 loc) · 3.67 KB
/
example_server.go
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// Copyright © 2017 The Things Network
// Use of this source code is governed by the MIT license that can be found in the LICENSE file.
package monitor
import (
"fmt"
"io"
"net"
"github.com/TheThingsNetwork/ttn/api/broker"
"github.com/TheThingsNetwork/ttn/api/gateway"
"github.com/TheThingsNetwork/ttn/api/router"
"github.com/golang/protobuf/ptypes/empty"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
var errNotImplemented = grpc.Errorf(codes.Unimplemented, "That's not implemented yet")
var errBufferFull = grpc.Errorf(codes.ResourceExhausted, "Take it easy, dude! My buffers are full")
func newExampleServer(channelSize int) *exampleServer {
return &exampleServer{
gatewayStatuses: make(chan *gateway.Status, channelSize),
uplinkMessages: make(chan *router.UplinkMessage, channelSize),
downlinkMessages: make(chan *router.DownlinkMessage, channelSize),
}
}
type exampleServer struct {
gatewayStatuses chan *gateway.Status
uplinkMessages chan *router.UplinkMessage
downlinkMessages chan *router.DownlinkMessage
brokerUplinkMessages chan *broker.DeduplicatedUplinkMessage
brokerDownlinkMessages chan *broker.DownlinkMessage
}
func (s *exampleServer) GatewayStatus(stream Monitor_GatewayStatusServer) error {
for {
status, err := stream.Recv()
if err == io.EOF {
return stream.SendAndClose(&empty.Empty{})
}
if err != nil {
return err
}
select {
case s.gatewayStatuses <- status:
fmt.Println("Saving gateway status to database and doing something cool")
default:
fmt.Println("Warning: Dropping gateway status [full buffer]")
return errBufferFull
}
}
}
func (s *exampleServer) GatewayUplink(stream Monitor_GatewayUplinkServer) error {
for {
uplink, err := stream.Recv()
if err == io.EOF {
return stream.SendAndClose(&empty.Empty{})
}
if err != nil {
return err
}
select {
case s.uplinkMessages <- uplink:
fmt.Println("Saving uplink to database and doing something cool")
default:
fmt.Println("Warning: Dropping uplink [full buffer]")
return errBufferFull
}
}
}
func (s *exampleServer) GatewayDownlink(stream Monitor_GatewayDownlinkServer) error {
for {
downlink, err := stream.Recv()
if err == io.EOF {
return stream.SendAndClose(&empty.Empty{})
}
if err != nil {
return err
}
select {
case s.downlinkMessages <- downlink:
fmt.Println("Saving downlink to database and doing something cool")
default:
fmt.Println("Warning: Dropping downlink [full buffer]")
return errBufferFull
}
}
}
func (s *exampleServer) BrokerUplink(stream Monitor_BrokerUplinkServer) error {
for {
uplink, err := stream.Recv()
if err == io.EOF {
return stream.SendAndClose(&empty.Empty{})
}
if err != nil {
return err
}
select {
case s.brokerUplinkMessages <- uplink:
fmt.Println("Saving uplink to database and doing something cool")
default:
fmt.Println("Warning: Dropping uplink [full buffer]")
return errBufferFull
}
}
}
func (s *exampleServer) BrokerDownlink(stream Monitor_BrokerDownlinkServer) error {
for {
downlink, err := stream.Recv()
if err == io.EOF {
return stream.SendAndClose(&empty.Empty{})
}
if err != nil {
return err
}
select {
case s.brokerDownlinkMessages <- downlink:
fmt.Println("Saving downlink to database and doing something cool")
default:
fmt.Println("Warning: Dropping downlink [full buffer]")
return errBufferFull
}
}
}
func (s *exampleServer) Serve(port int) {
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", port))
if err != nil {
panic(err)
}
srv := grpc.NewServer()
RegisterMonitorServer(srv, s)
srv.Serve(lis)
}
func startExampleServer(channelSize, port int) {
s := newExampleServer(channelSize)
s.Serve(port)
}